"It's certainly one of the first times that we've tapped into the Tex-Mex category," North American Burger King President Alex Macedo said. "It's one of the fastest-growing categories. Consumers like the freshness of it. They like the mix of flavors."

The fast-food restaurant has not said if the new item is intended as a competitor to Chipotle, but it would not be unlikely if so.

The Whopperito will be sold for the next three to four months at $2.99.